Keysight U3042AM20 User’s and Service Guide
75
U3042AM20
Troubleshooting the Test Set
4. Internal DC Power checks.
a. Set the front panel switch to the Standby position. No fans or
indicator lights should be operational.
b. Remove the bottom cover.
c. Set the Standby switch to the on position. Both the rear panel and
internal power supply fans should be operational. Verify that the DC
indicator LEDs are on as shown in
LEDs indicators for +9 and
−
10 Vdc are off.
Figure 51
DC Power Status LEDs
d. If the DC Indicator LEDs are not on, suspect the main power supply
module or front panel switch. The power supply (0950-4729)
terminal connections should also be verified with a DVM. Verify the
voltages on the power supply label.
e. If rear panel or deck fans is are not operating and the DC Indicator
LEDs are on, replace the fan.
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